*, ::before, ::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    height: 100vh;
}

.accueil {
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.accueil h1 {
    font-size: 120px;
    margin-bottom: 450px;
    text-align: center;
}

/* loader */

.loader {
    position: absolute;
    width: 100%;
    height: 100%;
    background: #000;
    display: flex; 
    justify-content: center;
    align-items: center;
}
.lettre {
    color: #383838;
    font-size: 80px;
    letter-spacing: 15px;
    margin-bottom: 150px;
    animation: flash 5.0s linear infinite;
}
@keyframes flash {
    0% {
        color: #FF1414;
        text-shadow: 0 0 7px #FF1414;
    }
    90% {
        color: #383838;
        text-shadow: none;
    }
    100% {
        color: #FF1414;
        text-shadow: 0 0 7px #FF1414;
    }
}

.lettre:nth-child(1){
    animation-delay: 0.1s;
}
.lettre:nth-child(2){
    animation-delay: 0.2s;
}
.lettre:nth-child(3){
    animation-delay: 0.3s;
}
.lettre:nth-child(4){
    animation-delay: 0.4s;
}
.lettre:nth-child(5){
    animation-delay: 0.5s;
}
.lettre:nth-child(6){
    animation-delay: 0.6s;
}
.lettre:nth-child(7){
    animation-delay: 0.7s;

}